WHEN DOES THE WATER HAVE TO BE SHUT OFF IN A VACANT HOUSE?

I've just become a snowbird and will be leaving my Michigan home vacant for much of the winter. What are the recommendations for shutting off the water while away? First, is shut off even necessary? If so, the whole house or just washing machine? Do sinks need to be drained? Toilets? Will pipes be harmed by being left empty for several months? Is anti-freeze necessary in the system if the heat is left on 60 degrees continuously. Any other advice for leaving an empty house for the winter?